21800933 has 18 divisors (see below), whose sum is σ = 27882918. Its totient is φ = 16983120.

The previous prime is 21800921. The next prime is 21800963. The reversal of 21800933 is 33900812.

It can be written as a sum of positive squares in only one way, i.e., 20638849 + 1162084 = 4543^2 + 1078^2 .

It is not a de Polignac number, because 21800933 - 2⁴ = 21800917 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21800963) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4091 + ... + 7767.

It is an arithmetic number, because the mean of its divisors is an integer number (1549051).

Almost surely, 2^21800933 is an apocalyptic number.

It is an amenable number.

21800933 is a deficient number, since it is larger than the sum of its proper divisors (6081985).

21800933 is a wasteful number, since it uses less digits than its factorization.

21800933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713 (or 3695 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21800933 is about 4669.1469242250. The cubic root of 21800933 is about 279.3562293224.

The spelling of 21800933 in words is "twenty-one million, eight hundred thousand, nine hundred thirty-three".